Plasma Deposition of Allylamine on Polymer Powders in a Fluidized Bed Reactor

Abstract

Summary: Thin films of plasma‐polymerized allylamine (PPAA) have been deposited onto polyethylene powders (PE) and polystyrene (PS) beads by using a low‐pressure 13.56 MHz plasma in a fluidized bed reactor. Chemical derivatization using a set of three different blocking agents has allowed quantitative measurement of the relative percentages of primary, secondary, and tertiary amines. Under optimized conditions, it is possible to incorporate up to 110 nmol of amine groups per gram of powder and with a selectivity of 75% for primary amines. Moreover, our data clearly show that for films deposited at 10 W the selectivity for primary amines is at a maximum, but this is at the expense of resistance to washing. A power of 20 W corresponds to an optimum value since both the amount of primary amines and the degree of resistance of the coating to solvents reach maximum values.

Functional Micropatterned Surfaces by Combination of Plasma Polymerization and Lift‐Off Processes

“…The N/C ratio (0.29) of the coating reveals a good retention rate of the starting monomer since the theoretical value for pure allylamine is 0.33. XPS analysis also reveals the presence of oxygen in the PAL coating (O/C = 0.12), this incorporation results from the excitation of oxygen residual traces present in the plasma chamber during plasma treatment and/or from an oxidation reaction during exposure of the films to the atmosphere 25,26. However, the oxygen uptake in our films is comparable to the values obtained by other teams 26,27.…”

Plasma deposition processes from acrylic/methane on natural fibres to control the kinetic release of lysozyme from PVOH monolayer film

“…In spite of the fact that the homogeneous treatments of powders and granules in low pressure plasmas is somewhat complicated and requires special reactor designs, many examples have been published (De Vietro et al, 2010;Favia et al, 2006;Figueiredo et al, 1999;Leroy et al, 2003;Tatoulian et al, 2005;Vivien et al, 2002;Wertheimer et al, 1998) on the surface modification of powders in low pressure plasmas. Most approaches, for example, deal with oxygen containing plasma, with the aim of increasing the surface density of the O-containing functionalities.…”

Plasma Processing of Scaffolds for Tissue Engineering and Regenerative Medicine

“…A large number of works deal with the plasma deposition of thin films, from nitrogen or oxygen containing organic monomers, aimed to deposit thin uniform and stable hydrophilic coatings, like alkyl amines [12][13][14][15][16][17][18][19][20][21], acrylic acid [22][23][24][25][26] allyl alcohol [27] ethylene/N 2 [28,29], allyl amine/acrylic acid [30] to some first attempts with atmospheric pressure discharges [31][32][33].…”